A method for preparing porous foam alloy and removing pore-forming agent sodium metaaluminate

A technology of sodium metaaluminate and porous foam, which is applied in the field of porous foam metal materials and porous foam alloy materials, can solve the problems of fragile samples, large damage to instruments, and long time consumption, and achieves improved preparation processes, simple methods, and reduced production. cost effect

Inactive Publication Date: 2015-11-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of long time-consuming removal of sodium metaaluminate particles as a pore-forming agent in the preparation process of existing porous metal foam materials and porous foam alloy materials, only small-volume samples can be processed, samples are easily damaged and instrument damage is large And other issues

Method used

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  • A method for preparing porous foam alloy and removing pore-forming agent sodium metaaluminate
  • A method for preparing porous foam alloy and removing pore-forming agent sodium metaaluminate
  • A method for preparing porous foam alloy and removing pore-forming agent sodium metaaluminate

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Effect test

Embodiment 1

[0028] (1) Preparation of nickel-manganese-gallium alloy raw materials: first prepare the materials according to the mass fraction of nickel as 48%, the mass fraction of manganese as 26.5% and the mass fraction of gallium as 25.5%, and then use the arc melting method to make nickel-manganese-gallium alloy ingot . Then the nickel-manganese-gallium alloy ingot was kept at 900°C for 48 hours to make the composition uniform, and then cooled down to room temperature with furnace cooling. (2) Pore-forming agent: use sodium metaaluminate particles as the pore-forming agent, select 58-75μm and 350-550μm mixed particles (mass 0.5g), put them into a crucible, and then place them together with the crucible in a high-temperature furnace Heat treatment at 1500°C for 4 hours to burn preliminary bonding. (3) Pressure casting: Put the crucible with sodium metaaluminate particles inside into a high-temperature furnace that can be vacuumed, place a pre-prepared nickel-manganese-gallium alloy i...

Embodiment 2

[0038] After the nickel-manganese-gallium alloy ingot is made by the arc melting method, sodium metaaluminate particles with a diameter of 280-355 μm are used as a pore-forming agent, put into a crucible, and heat-treated in a high-temperature furnace for 4 hours at 1470 ° C for preliminary bonding. Put the crucible with sodium metaaluminate particles inside into a high-temperature furnace that can be vacuumed, place the nickel-manganese-gallium alloy ingot prepared in advance on it, and then vacuumize it. After the vacuum of the system reaches above 10-2Pa, heat the crucible and the sample in the cavity, and slowly raise the temperature. When the temperature reaches 1180°C, keep it warm for 8 minutes, and then immediately inject argon until the pressure in the furnace is 0.1MPa. During this process, the molten nickel-manganese-gallium liquid is infiltrated into the gaps of sodium metaaluminate particles by argon pressure to obtain sodium metaaluminate particles and nickel-mang...

Embodiment 3

[0040]After the nickel-manganese-gallium alloy ingot is made by the arc melting method, sodium metaaluminate particles are used as the pore-forming agent, and the particles of 110-280 μm and 450-550 μm are selected to be mixed, put into a crucible, and heat treated in a high-temperature furnace at 1450 ° C for 4 Hours burn for initial bonding. Put the crucible with sodium metaaluminate particles inside into a high-temperature furnace that can be vacuumed, place the nickel-manganese-gallium alloy ingot prepared in advance on it, and then vacuumize it. After the vacuum of the system reaches above 10-2Pa, heat the crucible and the sample in the cavity, and slowly raise the temperature. When the temperature reaches 1170°C, keep it warm for 6 minutes, and then immediately inject argon until the pressure in the furnace is 0.1MPa. During this process, the molten nickel-manganese-gallium liquid is infiltrated into the gaps of sodium metaaluminate particles by argon pressure to obtain ...

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Abstract

The invention relates to a method of preparing a porous foam alloy and removing a pore forming material sodium metaaluminate. A metal or alloy composite material is prepared by adopting a pressure casting or sintering method and the pore forming material sodium metaaluminate. After the pore forming material sodium metaaluminate is removed, the porous foam metal or alloy is obtained. The method comprises the following steps: 1) excising an outer coating for the composite material to expose part of or all sodium metaaluminate particles; 2) putting the composite material into a reaction kettle; and 3) dissolving a sodium hydroxide solution with the concentration range of 80-300g / L and immersing the metal or alloy material; heating to 150-350 DEG C and insulating for 0.5-5 hours; then, cooling to room temperature, and obtaining the obtained porous structure material; soaking and washing by tap water or distilled water or ultrasonically cleaning within a short time and removing residual alkali liquor attached to the surfaces of porous metal and alloy to obtain the porous structure metal or alloy material.

Description

technical field [0001] The invention relates to a method of using sodium metaaluminate powder particles as a pore-forming agent. After preparing sodium metaaluminate and metal and alloy composite materials, the sodium metaaluminate in the composite material is removed to obtain porous foam metal materials and porous foam alloys. Material technology methods. Background technique [0002] Shape memory alloys integrating sensing, control and driving are a new type of functional materials. Memory alloys that can be regulated by various external fields have broad application prospects in many fields due to their special properties in output power, strain and response frequency. Among the memory alloys, ferromagnetic shape memory alloys represented by nickel-manganese-gallium (NiMnGa) alloys exhibit excellent performance. Single crystals of nickel-manganese-gallium alloys have achieved >108 magnetic shape memory mechanical cycles, with a maximum magnetic strain of 9.5 %, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08
Inventor 唐少龙韦俊都有为
Owner NANJING UNIV
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